Hydraulics of sub-superficial flow constructed wetlands in semi arid climate conditions

2003 ◽  
Vol 47 (7-8) ◽  
pp. 49-55 ◽  
Author(s):  
E. Ranieri
Keyword(s):  
Constructed Wetlands ◽  
Root Zone ◽  
Treatment Plant ◽  
Arid Climate ◽  
Zone Method ◽  
Climate Conditions ◽  
Hydraulic Gradients ◽  
Very High ◽  
Semi Arid

This paper reports the evaluation of the hydraulics of two constructed wetland (cws) plants located in Apulia (the South Eastern Italy region characterized by semi arid climate conditions). These fields were planted with Phragmites australis hydrophytes and are supplied with local secondary wastewater municipal treatment plant effluent. Each plant - Kickuth Root-Zone method based - covers an area of approx. 2,000 m2. The evapotranspiration phenomenon has been evaluated within perforated tubes fixed to the field bottom and very high values - up to 40 mm/d - were found. Hydraulic conductivity has been evaluated by in situ measurements at different field points. Hydraulic gradients and the piezometric curve within the field are also reported.

scholarly journals Analysis of thin film photovoltaic modules under outdoor long term exposure in semi-arid climate conditions

Solar Energy ◽  
2017 ◽  
Vol 157 ◽  
pp. 587-595 ◽  
Author(s):  
Ali Tahri ◽  
Santiago Silvestre ◽  
Fatima Tahri ◽  
Soumia Benlebna ◽  
Aissa Chouder
Keyword(s):  
Thin Film ◽  
Arid Climate ◽  
Climate Conditions ◽  
Photovoltaic Modules ◽  
Semi Arid

The Applicability of the Wastewater Treatment Plant in Othfresen as Scientific Documentation of the Root-Zone Method

1987 ◽  
Vol 19 (10) ◽  
pp. 19-24 ◽  
Author(s):  
Hans Brix
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Overland Flow ◽  
Root Zone ◽  
Treatment Plant ◽  
Experimental Treatment ◽  
Zone Method ◽  
Western Germany ◽  
Scientific Documentation

Up to the present time documentation for the functioning of the root-zone method is almost exclusively based on data from the Othfresen plant in Western Germany, a 22.5 ha large wetland, which since 1974 has received municipal wastewater. The present paper describes the working experiences from Othfresen, and evaluates the applicability of the data from Othfresen as basis for the scientific documentation of the root-zone method in general. It is concluded that the data from Othfresen are useless in the documentation of the root-zone method for the following reasons: (a) The loaded area has not until 1985 been well-defined, (b) the soil in the treatment plant is very atypical (old mine debris), (c) a major proportion of the wastewater does not penetrate the soil, but distributes on the surface as overland flow, (d) the quality of the water in the “defined” outlet, i.e. a well consisting of a PVC-tube, has no relation to the treatment of wastewater in the area, and (e) the true effluent to the recipient is of varying quality, especially as far as nitrogen is concerned. It is therefore necessary to await results from well-controlled experimental treatment plants before the functioning and the applicability of the root-zone method can be properly evaluated.

scholarly journals Improved Growth and Yield Response of Jew’s Mallow (Corchorus olitorius L.) Plants through Biofertilization under Semi-Arid Climate Conditions in Egypt

Agronomy ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1801
Author(s):  
Ahmed Fathy Yousef ◽  
Mohamed Ahmed Youssef ◽  
Muhammad Moaaz Ali ◽  
Muhammed Mustapha Ibrahim ◽  
Yong Xu ◽  
...  
Keyword(s):  
Farmyard Manure ◽  
Growth Yield ◽  
Growth And Yield ◽  
Arid Climate ◽  
Yield Response ◽  
Leaf Biomass ◽  
Trichoderma Spp ◽  
Climate Conditions ◽  
Npk Fertilizer ◽  
Semi Arid

This study was conducted to comparatively assess the effects of fertilization typology (organic, inorganic, and biofertilization) on the growth, yield, and compositional profile of Jew’s mallow. The experiment was carried out over two growing seasons, under semi-arid climate conditions on silty loam soil. We adopted three fertilization strategies: (1) inorganic NPK fertilizer (146, 74, and 57 kg ha−1 for N, P2O5, and K2O, respectively), (2) farmyard manure (36 m3 ha−1), and (3) a biofertilizer (a set of mixed cultures of Bacillus spp., Candida spp., and Trichoderma spp. at 36 L ha−1). Treatment combinations were control (without fertilization, T1), NPK fertilizer (T2), farmyard manure (FYM, T3), biofertilizer (T4), NPK+biofertilizer (T5), and FYM+biofertilizer (T6). The T5 treatment maximized both plant and leaf biomass (up to 31.6 and 8.0 t ha−1, respectively), plant height (68.5 cm), leaf area (370 cm m−2), leaf protein content (18.7%), as well as N, P, and K concentration in leaves (2.99, 0.88, and 2.01 mg 100 g−1, respectively). The leaves’ weight incidence was lower in T5 treatment (36.7%) as compared to the unfertilized plants (T1). The results revealed that the combined application of inorganic NPK plus biofertilizer is most beneficial to increase growth, yield, and nutrient accumulation in Jew’s mallow plants.

scholarly journals DRIS Norms for grafted and non-grafted red bell pepper in semi arid climate conditions in a greenhouse

2018 ◽  
Vol 36 (3) ◽  
pp. 371-376 ◽  
Author(s):  
Esteban Sánchez ◽  
Juan Manuel Soto-Parra ◽  
Pablo Preciado-Rangel ◽  
Alfonso Llanderal ◽  
María Teresa Lao
Keyword(s):  
Crop Production ◽  
Block Design ◽  
Bell Pepper ◽  
Arid Climate ◽  
Nutrient Ratios ◽  
Climate Conditions ◽  
Mature Leaves ◽  
Randomized Block Design ◽  
Coefficients Of Variation ◽  
Semi Arid

ABSTRACT The objective of this study was to compute and compare DRIS norms for grafted and non-grafted red bell pepper crops grown in semi arid climate conditions. DRIS norms were computed with 84 samples of first young mature leaves collected during developed stage. The experiment had a completely randomized block design, and the values obtained for each plant and each variable were considered as independent replicates. Thirty-two DRIS norms nutrient ratios and coefficients of variation (CV) were computed from N, P, K, Ca, Mg, Fe, Cu, Zn and Mn analytical results. The ratios P/N and K/N in grafted and non-grafted pepper plants, showed low CV and therefore may play a fundamental role in crop production according with the DRIS norms calculated, since as light modification in the nutrient concentration led to a significant change in the nutritional balance. In conclusion, DRIS norms are sensitive for grafted and non-grafted plants. This work may signify an improvement in the nutritional diagnosis of grafted and non-grafted red bell pepper in semi arid climate conditions under a shaded greenhouse.

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